Binding post



April 15, 1924, 1,490,336

A. J. LUSH BINDING POST Filed Jan. 19 1920 INVENTOR ARTHUR. cpLusH ATTORNEY Patented A 24 ARTHUR LUSH, OCF CAMBRIDGE, MASSACHUSETTS, ASSIGNQR TO RAWSON ELEC- TRICAL INSTRUMENT COMPANY, OF CAMBRIDGE, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

BINDING rosr.

Application filed January 19, 1920. Serial No. 352,483.-

have invented a new and useful Improve-- of which the followment in Binding Posts ing is a specification. The present invention relates to binding 1 posts, and more particularly to posts the clamping caps of which are readily freely movable, but in which provision is made for preventing the cap falling off the clamping post and becoming lost. The object of the invention is to provid an improved binding post of the above-described character Which shall be simple in construction, cheap to manufacture and effi- "cient in operation.

With this end in view, a feature of the post with an enlarged end that is adapted to lie normally in an enlarged chamber of the cap. From the chamber leads a reduced 2 bore within which normally lies the body of the clamping post and the walls of which are adapted to bind upon the enlarged end to render diflicult the removal of the cap.

To the attainment of the above-named object, the invention consists of. the improved ing the enlarged end of a modified clamping post positioned within the enlarged chamber of the cap; and Figs. 4, 5 and 6 are views of modifications. V 1 'The clamping post of the present invention is threaded at 2 and 4 and is provided with an intermediate clamping element 6 about which, and about a ortion 8, is molded a boss 10 of insulatmg material.

The threaded portion 2 is adapted to enter, an opening in a panel (not shown) so that the boss 10 may rest uponthe face thereof, and the post may be secured in suchposition" upon the panel by a nut threaded upon the portion 2. I

invention resides in providing the clamping A cap 12 is provided with an enlarged 5e chamber 14 and 'a reduced bore 16 leading therefrom, within which bore is adapted to lie the portion 4 of the clamping post. The reduced bore 16 is preferably threaded and the portion 4 is provided with threads 00 adapted to cooperate with the threads of the bore. The body of the terminal portion 4 is of less diameter than the'diameter of the bore 16, as is shown more particularly in Fig. 3, so as to provide an easy fit. The cap as may thus be readily freely rotated upon the clamping post to' move the clamping ele-- ment 18 into'and out of. engagement with the clamping element 6. To prevent the cap falling olf the clamping post by continued free movement thereof upon the post, the end20 is enlarged to such diameter that the said end may bind lightly upon the walls of the reduced bore, as shown in Fig. 2, and thus, though not preventing the removal of the cap, render such removal difficult. The easy or accidental removal of the cap from the clamping post is therefore prevented, though the removal may be effected by sufli: cient turning pressure exerted upon the cap so 12. The enlarged end 20', which is preferably, though not necessarily, threaded, lies normally in theenlarged chamber 14, the walls of which it can not engage, so that a; limited degree of free movement of the cap is thus provided for. a The end 20 may be enlarged in any desired manner. A convenient method of enlarging the end is to slot it to form a fork, expand the prongs 22 of the fork, and wedge material into the space provided between the pr ngsi The s ace between the prongs may, if desired, be lled with a metal in liquid condition, like solder 24, which is then 9.1- lowed to solidify. It is found, in practice, usually, that neither the wedge nor the filling. material is necessary, the process of expending imparting a set to the prongs which is suflicient for ordinary purposes.

As the end 20 of the binding post may we be inserted into the-chamber 14 through the reduced bore 16,3,it is not essential that the chamber 14 be ppen, as has been the case with certain types of binding posts hitherto employed. The advantages of the we closed-chamber cap may thus be obtained, according to the present invention, in combination with ablampingfpost the end of which is expanded. To the attainment of this result, the-chamber may be closed by a plate 26, after which an insulating cover ing 28 may be molded thereabout and about the base 30 upon which it is positioned.

In some cases, it is desirable that the cap be permanently secured to the clamping post so as not to be removable therefrom. One method of bringing about this result in accordance with the present invention is illustrated in Figs. 4 and 5. A Wedge 32 may be partly inserted between two or more prongs 22 before the end 20 is threaded through the reduced bore 16. Upon sufiicicntly continued rotation of the clamping post, the end of the wedge 32 will engage the inner face of the plate 26, and further rotation of the clamping post will force the wedge into the space between the prongs, causing the prongs to expand to such de gree as to prevent the removal of the clamp- 1ng post through the bore 16.

It will be understood that the invention is not limited to the exact embodiments thereof herein illustrated and described,-

but that it is susceptible to modification within the spirit and scopeof the appended claims.

hat is claimed as new is 1. In combination, a cap having a closed chamber and a reduced bore leading from the chamber, and a post in the bore the body of which is of cross dimension less than the cross dimension of the bore and having means normally positioned in the chamber of such dimension as to adapt the said means to bind lightly upon the walls of the bore without preventing the removal of the cap from the post, a portion of the body of the post being also normally positioned in the chamber, whereby the cap is freely movable along the said portion of the body of the post but is restricted against free movement when the said means binds against the walls of the bore, the cap being adapted to the applied'to the post and removed from the post by the application of a force sutiicient to overcome the binding action of the said means against the walls of the bore.

2. A binding post comprising a clamping cap having a closed chamber and a reduced threaded bore leading from the chamber, and a cooperating threaded clamping post threaded in the bore the body of which is of diameter less than the diameter of the bore and having a threaded end normally positioned in the chamber of such diameter as to adapt the said end to bind lightly upon the threaded walls of the bore without preventing the removal of the cap from the post, a portion of the body of the post being also normally positioned in the chamber, whereby the cap is freely threadedly movable along the said portion of the body of the post but is restricted against free movement when the said end binds against a the walls of the bore, the cap being adapted to be applied to the post and removed from the post by the application of a force suiticient to overcome the binding action of the said end against the walls of the bore.

3. A binding post comprising a clamping cap having a closed chamber and a reduced threaded bore leading from the chamber,

and a cooperating threaded clamping post threaded in the bore the body of which is of diameter less than the diameter of the bore and having an expanded threaded forked end normally positioned in the chamber of diameter greater than the diameter of the body of the post, the said diameter being such as to adapt the said end to bind lightly upon the threaded walls of the bore without preventing the removal of the cap from the post, a portion of the body of the post being also normally positioned in the chamber, whereby the cap is freely threadedly movable along the said portion of the body of the post but is restricted against free movement when the said end binds against the walls of the bore, the cap being adapted to be applied to the post and removed from the post by the application of a force sufficient to overcome the binding action of the said end against the walls of the bore.

In testimony whereof. I have hereunto subscribed my name this 17th day of January, 1920.

ARTHUR J. LUSH. 

